"Thanks to the great discoveries made thirty years ago, we have entered a new era in the struggle against monsters. According to our school tradition, 10 days later will be the school celebration art activities, our class programs, starting next week to prepare..." The setting sun slanted into the classroom of Class A, senior three, which was separated by A line of light and dark. The graceful head teacher stood on the platform, holding the class meeting slowly, the beautiful writing on the e...